“For the activity of the mind is life”

“The energy of the mind is the essence of life.”

“Happiness is a state of activity.”

“Therefore the activity of God, which surpasses all others in blessedness, must be contemplative; and of human activities, therefore, that which is most akin to this must be most of the nature of happiness”

“Distance does not break off the friendship absolutely, but only the activity of it.”

“All paid jobs absorb and degrade the mind.”

“Educating the mind without educating the heart is no education at all.”